Volume 13 > Part 1 > Year 2015 > Page 127 > Ericaceae > Rhododendron

2. Rhododendron delavayi Franch.wfo-0001229506

Bull. Soc. Bot. France 33: 231. 1886; Hemsl. & E.H.Wilson, Bull. Misc. Inform. Kew 1910: 108. 1910; Sleumer, Blumea, Suppl. 4: 51. 1958; Young & Chong, Rhododendron China 491. 1974; M.Y.Fang et al. i, Fl. China 14: 376. 2005.— R. arboreum subsp. delavayi (Franch.) D.F.Chamb., Notes Roy. Bot. Gard. Edinburgh 37 (2): 328. 1979; 39 (2): 331. 1982. Plate XII: 6–7.

Accepted Name : This is currently accepted.

Synonyms & Citations :

Description : Shrub or small tree, evergreen, 2–10 m tall; young branches densely to laxly covered with whitish-grey sponge-like hairs. Leaves in pseudowhorls of 5–10, oblanceolate, lanceolate-oblong, 5.5–15 by 2–5.2 cm; glabrous above, whitish-grey and densely covered by branched hairs forming a sponge-like indumentum beneath; base cuneate to truncate; margin entire; apex acute to rounded, usually with short mucro, rarely retuse; veins 12–20 on each side; petiole 0.8–2.5 cm long, grooved above, covered with dense, branched hairs, sometimes with glandular hairs, usually deciduous. Flowers red, 5–15 in a terminal subumbeliform inflorescence; peduncle 1.5–2.5 cm long; pedicels 0.4–1.3 cm long, with dense whitish to light brownish hairs. Calyx 2 mm long, 5–6-lobed, lobes triangular, apex rounded. Corolla campanulate-cylindrical, 3.5–4.5 by 1.5–2 cm, 5–6 lobed; lobes rounded, 1.5 by 1–1.5 cm. Stamens 10, unequal; filaments white, glabrous, reddish-purple at base; anthers brown. Ovary cylindrical, 5–6 by 3.5 mm, with dense whitish or light brownish hairs; styles 3–4 cm long, glabrous; stigma capitate, dark red. Capsules cylindrical, 1.2–2 by 0.6–0.8 cm, densely covered with black hairs. Seeds ca 1 by 0.3 mm.

Thailand : NORTHERN: Chiang Mai (Doi Inthanon, Doi Lang Ka, Doi Mon Chong, Doi Ang Khang).

Distribution : India, Myanmar, Yunnan (type).

Ecology : In montane forests, 1,800–2,500 m alt. Flowering: February–May.

Vernacular : Kham daeng (คําแดง)(Chiang Mai); kulap daeng (กุหลาบแดง), kulap phan pi (กุหลาบพันปี)(Central).